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Chapter 6 Modular Programming with Functions 41. In the program developed in Section 6.10, we searched for subintervals for wh the function values at the endpoints had different signs; we estimated the location to be the midpoint of the subinterval. A more accurate of the location is usually the intersection of a straight line through t values with the x-axis, as shown in Figure 6.23. f(a) f(c) f(b)